SU1710847A1 - Well pump plant - Google Patents

Abstract

The invention relates to the oil and gas industry and m. used in the operation of wells equipped with submersible electric pumps. The purpose of the invention is to increase the operational reliability by intensifying the cooling of the electric motor when operating in a well. The installation includes a submersible unit 1 comprising a pump, a drive motor (E) in the housing 3 and clamping elements 2, which are operable to interact with the casing 7 of the well for eccentric placement in the last unit 1. E is equipped with a surface 4 of a material with high thermal conductivity of solid cross section, the inner contour of which is made covering a part of the perimeter of the housing 3, and the outer one is formed by a part of a circle with a radius equal to the inner radius of the casing 7 in places E. Placement E. The overhead element 4 is fixed on the housing 3 on the side opposite to the position of the clamping elements. Direct thermal and mechanical contact of the overhead elements 4 with a portion of the surface of the casing 7 contributes to increased heat transfer from E to the casing 7 and the surrounding ground mass. 1 il. C / S

Description

The invention relates to the oil and gas industry and can be used in the operation of wells equipped with submersible electric pumps.

Known borehole pump installation containing suspended on a tubing submersible electric pump [1].

The main disadvantage of this borehole pumping unit is its low operational reliability, due to its limited life due to frequent failure due to overheating of the electric motor in operating mode.

Overheating of the electric motor is a consequence of its insufficient cooling in the well by the flow of the washed liquid.

Due to some curvature of the well, the electric motor of the submersible pump is pressed against the wall of the well due to its own weight. Due to the large hydraulic resistance at the edges of the crescent gap between the electric motor and the casing, the fluid flows very slowly, not providing cooling of the electric motor housing from all sides.

Closest to the proposed is a downhole pumping unit containing a submersible unit, including a pump, a drive motor having a housing, and clamping elements installed with the possibility of interaction with the casing of the well for eccentric placement of the unit in the latter [2].

The disadvantage of this borehole pumping unit is its low operational reliability, also due to overheating and subsequent failure of the submersible electric motor due to insufficient cooling in the state pressed against the casing wall.

The aim of the invention is to increase operational reliability by intensifying the cooling of the electric motor.

Improving operational reliability is to increase the life of the well pumping units.

This goal is achieved in that the downhole pumping unit containing a submersible unit, including a pump, a drive motor having a housing, and clamping elements mounted to interact with the casing of the well for eccentric placement of the unit in the latter, is equipped with an overhead element made of material with high thermal conductivity of a solid cross section, the inner circuit of which is made covering part of the perimeter of the motor housing, and the outer one is formed by a part of the with a radius equal to the inner radius of the casing of the well at the location of the electric motor, and said element is mounted on the motor housing 'from the side opposite to the location of the pressure elements.

The drawing schematically depicts a downhole installation.

The downhole pump installation includes a submersible unit 1, clamping elements 2, a pump (not shown), a drive motor in the housing 3 with a patch element 4 with an internal circuit 5 covering part of the perimeter of the housing 3, and an external circuit 6 formed by a circle with a radius equal to the inner radius of the casing 7 at the location of the electric motor.

The patch element 4 is mounted on the motor casing 3 from the side opposite to the location of the clamping elements 2, installed with the possibility of interaction with the casing 7 of the well for eccentric placement of the unit in the latter.

The housing 3 of the electric motor forms through overhead elements 4 made of a material with high thermal conductivity of a continuous cross section, mechanical and thermal contact with part of the surface area of the casing 7, which has direct thermal contact with the surrounding earth. In this case, the casing and the earth act as a radiator-heat sink. During operation of the downhole pumping unit, the fluid absorbed by the pump washes and cools the uncovered overhead element 4 of the motor housing 3 through the channel formed with it and the open surface of the casing 7, which together improves the thermal regime of the working electric motor and thereby increases the operating life of the downhole pumping unit.

Claims (1)

Claim A downhole pump installation comprising a submersible assembly including a pump, a drive motor having a housing, and clamping elements mounted to interact with the well casing for eccentric placement of the assembly in the latter, characterized in that, in order to increase operational reliability by intensifying motor cooling , the latter is equipped with an overlay element of a material with a high 5 thermal conductivity of a continuous cross section, the inner contour of which is made n covering part of the perimeter of the motor housing and the outer circumferential portion formed with a radius equal to the radius of the inner well casing in a place of accommodation motor, wherein said element is secured to the motor housing on the side opposite the location of the pressing members.